package com.lb.aicodebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.lb.aicodebackend.dto.UserQueryRequest;
import com.lb.aicodebackend.exception.BusinessException;
import com.lb.aicodebackend.exception.ErrorCode;
import com.lb.aicodebackend.model.enums.UserRoleEnum;
import com.lb.aicodebackend.model.vo.LoginUserVO;
import com.lb.aicodebackend.model.vo.UserVO;
import com.mybatisflex.core.query.QueryWrapper;
import com.mybatisflex.spring.service.impl.ServiceImpl;
import com.lb.aicodebackend.model.entity.User;
import com.lb.aicodebackend.mapper.UserMapper;
import com.lb.aicodebackend.service.UserService;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.lb.aicodebackend.constant.UserConstant.USER_LOGIN_STATE;

/**
 * 用户 服务层实现。
 *
 * @author <a>libo</a>
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>  implements UserService{

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        //1、校验参数
//        if (ObjUtil.isEmpty(userAccount) || ObjUtil.isEmpty(userPassword) || ObjUtil.isEmpty(checkPassword)){
//            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数不能为空");
//        }
        if (StrUtil.hasBlank(userAccount,userPassword,checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数不能为空");
        }
        if(userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户名长度不能小于4位");
        }
        if( userPassword.length()<8 || checkPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码长度不能小于8位");
        }
        if (!userPassword.equals(checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"两次密码不一致");
        }
        //2、查询用户是否已经存在，调用mapper属性，查询记录条数count>0
        QueryWrapper queryWrapper =new QueryWrapper();
        queryWrapper.eq("userAccount",userAccount);
        long count = this.mapper.selectCountByQuery(queryWrapper); //selectCountByQuery 方法用于根据给定的查询条件查询记录数。
        if (count > 0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户名已存在");
        }

        //3、加密密码
        String encryptPassword = this.getEncryptPassword(userPassword);

        //4、创建用户，插入数据库
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("wuming");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user); //save 方法用于插入一条新的记录到数据库中。
        if (!saveResult){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户注册失败，数据库错误");
        }
        return user.getId();
    }

    @Override
    public String getEncryptPassword(String userPassword) {
        //盐值，混淆密码
        final String SALT = "LIBO";
        return DigestUtils.md5DigestAsHex((userPassword + SALT).getBytes(StandardCharsets.UTF_8));
    }


    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null){
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user,loginUserVO);
        return loginUserVO;
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        if (StrUtil.hasBlank(userAccount,userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if (userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账户错误");
        }
        if (userPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码错误");
        }
        //加密
        String encryptPassword = this.getEncryptPassword(userPassword);
        //查询用户是否存在
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.eq("userAccount",userAccount);
        queryWrapper.eq("userPassword",encryptPassword); //也要将用户输入的密码加密后才能和数据库的密码对应上
        User user = this.mapper.selectOneByQuery(queryWrapper);
        //用户不存在
        if(user == null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户不存在或密码错误");
        }
        //记录用户的登录态
        request.getSession().setAttribute(USER_LOGIN_STATE,user);
        //获取脱敏后的用户信息
        return this.getLoginUserVO(user);
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        //先判断是否已经登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if(currentUser==null || currentUser.getId() == null){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"用户未登录");
        }
        //从数据库查询（追求性能的话可以注释，直接返回上述结果）
        long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"用户不存在");
        }
        return currentUser;
    }

    @Override
    public Boolean userLogout(HttpServletRequest request) {
        //先判断用户是否已经登录
        Object  user = request.getSession().getAttribute(USER_LOGIN_STATE);
        if (user==null){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"用户未登录");
        }
        //移除登录态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null){
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user,userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)){
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    @Override
    public QueryWrapper getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        return QueryWrapper.create()
                .eq("id", id)
                .eq("userRole", userRole)
                .like("userAccount", userAccount)
                .like("userName", userName)
                .like("userProfile", userProfile)
                .orderBy(sortField, "ascend".equals(sortOrder));
    }



}
